Outlines of Astronomy |
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Page xi
... increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural ...
... increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural ...
Page xiv
... increase and diminution . Average effect in a whole revolution . Compensation in a complete revolution of the nodes . Lagrange's theorem of the stability of the inclinations of the plane- tary orbits . Change of obliquity of the ...
... increase and diminution . Average effect in a whole revolution . Compensation in a complete revolution of the nodes . Lagrange's theorem of the stability of the inclinations of the plane- tary orbits . Change of obliquity of the ...
Page 30
... increase that angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident ... increases ; 2dly , that the distance of the vis- ible horizon1 or boundary of our view from the eye , viz . the line ...
... increase that angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident ... increases ; 2dly , that the distance of the vis- ible horizon1 or boundary of our view from the eye , viz . the line ...
Page 40
... increases . Objects near the horizon appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the ...
... increases . Objects near the horizon appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the ...
Page 43
... increases in approaching the horizon . Were every visible point in the sun's circumference equally raised by re- fraction , it would still appear circular , though displaced ; but the lower portions being more raised than the upper ...
... increases in approaching the horizon . Were every visible point in the sun's circumference equally raised by re- fraction , it would still appear circular , though displaced ; but the lower portions being more raised than the upper ...
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Common terms and phrases
altitude amount angle angular appear apsides ascertained astronomers axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater heavens heliocentric horizon inclination increase inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith